The act of passing one turd from the anus of one individual to another anus of an individual, achieved with care, patience and lubrication. First witnessed in the German Porno film 'Choc Horror'.

I watched as the two lesbians engaged in brown docking, slowly, one girl strained to expel her turd whilst the other girl, the receiver, relaxed her anal sphincter muscles and received the turd completely into her own rectum.